Pipe-wrench.



No. 844,852. PATENTED FEB. 19, 1907.

F. J. DEARBORN, F. GAVALLARO n A. S. MAUKENZIE.

PIPE WRENCH. rPLIoATIoN FILED xn19.1aoe.

nl: Nmuus FM'ARS co., wAsHma'roN, D.

UNITE STATES' ATEN'I FFICE.

FRANKLIN J. DEARBORN, FRANCESCO CAVALLARO, AND ANDREW S. MACKENZIE, OF SAN JOSE, CALIFORNIA.

PIPE-WRENCH.

Specification of Letters Patent.

Patented Feb. 19, 1907.

Application tiled May 19,1906. Serial No. 317,698.

new and useful Improvements in Iipel/Vrenehes, of which the following is a speeiiication.

Our invention relates to pipe-wrenches. Its object is to provide a simple practical durable self-adjusting wrench t'oi gripping pipe or nuts of different sizes.

It consists of the parts and construction and combination of parts as hereinafter more fully described and olaiined, having reference to the accompanying drawings, in which- Figure l is a side elevation of the wrench opened out. Fig. 2 is a plan view oi' the same. Fig. 3 is a side elevation et the wrench in closed position.

A represents a handle oi suitable construction having a jaw member 2, pivoted to it at one end, as at 3, and a second jaw member 4, pivoted to its under side between its ends, as at 5.

The jaw member 2 is made angular, with a l portion adapted to extend in line with the handle A, as shown in Fig. l. The member 4 has a guide-strap 6 to slide on the horizontal part ot member 2, and this strap or guide is suitably shaped to accommodate the jaw 2 to the various pivotal movements of the handle about the pivot 5.

' The biting-surfaces of the jaws 2 4 may be of any suitable shape or contour and are preierably corrugated, as shown. Freferabl y these surfaces will stand in outwardly-divergent planes when the wrench is in the position indicated in Fig. 1, so as to permit as large a pipe as possible to be accommodated and to allow these biting-surfaces to approach each other in as nearly parallel planes as possible, as indicated in Fig. 3.

In using the wrench the inner jaw is placed against the pipe and the jaw is adjusted by breaking the handle over the pivot-pin 3, connecting the outer jaw with the handle.

In so doing the pivot of the inner jaw is made a i'ulcrum and the handle a lever, the handle werking over the pivot of the inner jaw and drawing the outer jaw through the guide 6 the necessary distance l'or the outer jaw to come in contact with the pipe. As the outer jaw eeines in contact with the pipe the increased pressure upon the handle in turning the pipe clamps the jaws upon the pipe and holds the pipe i'ast.

To release the wrench, the handle is straightened, which spreads the jaws.

Thus it is seen that by simply laying the wrench over the pipe so that the jaws straddle the pipe and bending the handle the wrench adjusts itself automatically to pipes oi a great variety et' sizes and that the pipe is released by merely straightening the handle again.

Having thus described our invention, what we claim, and desire te secure by Letters Iatent, ish An improved pipe-wrench consisting of a bar having a transverse jaw at one end, a handle pivoted and turnable upon the oppesite end oi said bar, a second jaw member having one end pivoted to the handle and having its body portion straight and parallel with the iirst bar and handle when said bar and handle are normally longitudinally in line, said second jaw member having a guidestrap for the reception oi the First-named bar and said jaw member and the bar having their gripping-surfaces normally arranged in outwardly-divergent planes, but which giadually approach into parallelism when the handle is turned about its pivotal center to disturb the normal parallelism of the bar and handle and the body portion of the second jaw member.

Iii testimony whereof` we have hereunto set our hands in presence et' two subscribing witnesses.

FRANKLIN J. DEARBORN. FRANCESCO CAVALLARO. ANDREV S. MACKENZIE.

Vitnesses:

l/VALTER L. RAvEN, OSCAR D. RienARDsoN. 

